Question $5$

$\frac{0}{3}$ pts

Which of the following is a good constraint to model the fact that activity $A$ is an immediate predecessor of activity $B?$

$x_A-x_B-y_{B}5$

$-x_A+x_B+y_{B}5$

$-x_A+x_B+y_{B}5$

$x_A+x_B+y_{B}5$

None of the above.